Aardsma was diagnosed with a sprain of the ulnar collateral ligament in his right elbow following an MRI exam on May 7. There was some fear that he’d need Tommy John surgery, but after visiting Dr. Lewis Yocum in Los Angeles on Friday, it was determined that no surgery would be needed.

Aardsma had offseason surgery on the labrum on his left hip, and he was nearing the completion of his rehabilitation program when he felt soreness in his forearm.

Brandon League, the Mariners’ closer in Aardsma’s absence, was highly effective to begin the season but has struggled recently, particularly in Seattle’s just-completed series against Baltimore.